2. Any recommendations for ordering spin-welded fittings as part of the package?

After my plywood-and-resin tank attempt and failure, I'm not going chance the home-brew method anymore on these tanks. Need to hire this one done. I know I could turn to google, but if someone here has experience with a vendor, I'd rather get the straight scoop.

2. Any recommendations for ordering spin-welded fittings as part of the package?

Ronco used fittings from this company for my four tanks: http://www.bunnweb.org/spinwelding.com/page2.htmIf you have a choice, use the Heavy-Duty female fittings - they stretch less when you put valves and whatnots into them. If space is limited you can use the Flush fittings, but some Valterra threaded flanges may end up too close to the tank with them.

I got my 3 tanks from Ronco. I ordered (2) 115 gallons marine tanks and a specific shaped 35 gallon black tank. The total cost for me with shipping was under 1k.

I searched high an low and checked with local vendors as well but in the end Ronco (iIMHO) had the best selection and quality tanks for the buck. Linda hinted to me when I ordered that if I had a "business" account they would be 1/2 the listed price. Great service and I think there are others who have had the same experience. There are other cheaper ways to build tanks, make any container into a tank with spin welded fittings...but I just wanted to get it done. Bought the tanks they fit perfect and what I didn't save in $$ I saved in time and peace of mind.